Vat dye.



' l] l l'lilll PAUL rzaormscnawsxz. or vonWmxEL, mama ELBEBFELD, GERMANY, ASSIGNOR TO maaanraamezan roam. amazon. BAYER a 00., or ELBERFELD, GERMANY. A

CCRPQBATION Q GERMAIIY.

No Drawing.

To all whom it may concern:

lle it known that l, PAI'L THOMAS- ('IHCWSKI. doctor of philosophy, chenrist, citizen of the German lhnpire, residing at Yohwinkel, near Elhert'eld, Germany, have invented new and useful lin roven1ents in New \at Dye, of which the following is a specification.

My invention relates to the production of new antlu'acene derivatives. They are obtained by converting an aininoanthrarplinone into its: derivatives containing in the amino group an oxy-iiaphthyl-carbonyl group The reaction is carried out by treating an anii.ioanthrznpiinone with a naphthol earboxylic acid.

The new products are after being dried and pulverized colored oowders practically insoluble in water; soluule in concentrated sulfuric acid with from a red to brown to olive color. They yield on treatment with hydrosultite and caustic soda lye from red to brown vats suitable for dyeing and printinp' the textile fiber from yellow to red to brown to violet shades. They also form valuable lakes.

ln order to illustrate the new process 1' can proceed as follows, weight :'l( parts of l-aniinoanthraquinone are heated to 125 t. with ltlt) parts e of nitro benzene. parts of 2-naphthol *l-carboxylic acid and ts parts of SOUL. The new condensation product crystallizes from the cool- P v lug liquid in the shape ot m=ziligevellowprisms which are tiltered otl and dried. it is soluble H1 pyridin \v1th a yellow color, in

concentrated sulfuric acid with a reddish brown color. By treatment with hydro the parts being by' Specification of Letters Patent.

t' Application filed May 29, 1909. Serial No. 499,147.

is soluble in pyridin with my hand in the VAT DYE.

rammed em. a, race.

sultite and NaOH a red vat is obtained which dyes cotton, wool or silk pure yellow shades. ()ther antinoanthraquinones or other naphthol-carboxylic acids may be used. Products of similar qualities are thus obtained, 0. g. from 1-a1ninoanthraquinone and 1-- 'iphthol- 2carboxylic acid (dyes lnownishyellow), t'roni 1.5- dialninoanthraquinone {and naihthol-3-carboxylic acid (dyes reddishyel low) I claim y 1. The herein described new vat dyesmtt's of the anthracene series which can he obtained from a naphthol-carboxylic acid and an aminoanthraquinone, which dyestuffs are, after being dried and pulverized, colored powders practically insoluble in water, soluble in concentrated sulfuric acid with a red to brown to olive color; giving from orange to red to brown vats with hydrosnlfite and caustic soda lye, which vats dye the textile fiber from yellow to red to brown to violet shades, substantially as described.

The herein described new vat dyest-ufl' of the. anthraeene series which is the o'xynaphthyl carbonyl 1 -aminoanthra uinone. which dyestutt' is, after being dried and pulverized, an orange-yellow powder which a yellow color; soluble in concentrated sulfuric acid with a reddish-brown color; givin a red vat with hydrosultite and caustic S()( a lye, which vat dyes the textile fiber bealltiful yellow shades.

substantially as described.

In testimony whereof I have hereuntoset presence of two subscribing witnesses.

PAUL raeaiscaawsai. h. s.]

\Vitnesses ()rro Koala, WILLY KLEIN. 

